Klassik is an open-source project that reconstructs the KDE 3 desktop experience on top of modern KDE Plasma 6 rather than merely applying a retro theme. It recreates core KDE 3 panel components - K Menu launcher, Quicklaunch, task manager, lock/logout buttons, and analog/digital clocks - implemented in C++ and QML and rendered with QStyle and QPainter to closely match the original look. The project also brings back KDE 2/3 color schemes and period wallpapers, rewrites the legacy KDE 2/3 QStyle for Qt 6, and ports older KWin window decorations to the KDecoration3 API so the visual and behavioral details of the old desktop are faithfully reproduced.
Under the hood Klassik is built against Qt 6, KDE Frameworks 6 and Plasma 6 libraries (including PlasmaQuick, KSysGuard and KDecoration3) and supports Wayland and fractional scaling. Installation requires cloning the GitHub repo, checking out the latest tagged release, building with CMake and installing system-wide; the theme is then selectable in System Settings → Colors & Themes → Global Theme. The developer advises using tagged releases rather than the frequently unstable master branch. Combined, these elements deliver a genuine KDE 3-era experience running on current KDE technologies.
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